Upgraded Assembled Headphone Amplifier Board Preamp Base On Lehmann Amp
Operating voltage: Recommended AC15V-0-AC15V
PCB Specifications: 105 * 150mm * 1.6mm
Frequency response: 10Hz (-0.3db) – 35KHz (-1db)
Distortion: <0.001% (6mW / 300R)
Output power: 200mW / 300R; 400mW / 60R
Power consumption: <5W
Input impedance: 47kΩ
Adapter Impedance: 8 – 2K
Output Interface: 6.35mm X 2
LINE OUT: 60Ω
PHONE OUT: 5Ω
Without the ALPS blue Potentiometer.
Upgraded Version Highlights:
Upgrade the main electrolysis with nichicon KG type II 3300uf 25V.
Upgrade decoupling capacitance with nichicon MUSE 100UF 25V and WIMA.
Upgrade the high-quality gold-plated headphone jack.
Upgrading the op amp to BB OPA2134.
Upgrading the main resistance to the Philips brand.
Using Precision paired genuine Toshiba A1358 C3421
We can provide the parts list and schematic via email.